The body was left on display in a village in the Syrian province of Deir ez-Zor after the killing, a statement by the attorney general said.
The suspect is also accused of tormenting prisoners of Islamic State and beating a driver during a roadside check.
It was not clear how and when the young man came to Germany.
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The suspect is also accused of tormenting prisoners of Islamic State and beating a driver during a roadside check.
It was not clear how and when the young man came to Germany.
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